We surveyed an effectively random sample of 95,649 Facebook users over the age of 18. Each of these users answered an array of questions on demographics, smoke masks, and whether they were in the region at the time of the fires. Of those surveyed, 24,486 Facebook users were in the area of the two major bushfires under consideration in this article. Here, we are focusing on two bushfires that started on or about December 18, 2019 – the Green Wattle Creek Fire in Eastern New South Wales and the Cudlee Creek Fire in Adelaide Hills, South Australia (Figure REF ). Of those who said they were in the area, 7,073 users said they were affected by the fires (Q 2: loc_q). These users were then asked a detailed set of questions on displacement outcomes. To guarantee we only consider the target population, we limit our displacement-related analysis to these 7,073 users. This is, effectively, a form of rejection sampling and will maintain our sample properties [1]}. The survey was in the field for two weeks, from February 20, 2020 to March 5, 2020, approximately two months after the bushfires began. This timing strikes a balance between decaying respondent recall and allowing the consequences of a displacement to play out more fully.
